// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef MEDIA_AUDIO_ALSA_ALSA_UTIL_H_
#define MEDIA_AUDIO_ALSA_ALSA_UTIL_H_

#include <alsa/asoundlib.h>
#include <string>

namespace media {
class AlsaWrapper;
}

namespace alsa_util {

snd_pcm_format_t BitsToFormat(int bits_per_sample);

snd_pcm_t* OpenCaptureDevice(media::AlsaWrapper* wrapper,
    const char* device_name,
    int channels,
    int sample_rate,
    snd_pcm_format_t pcm_format,
    int latency_us);

snd_pcm_t* OpenPlaybackDevice(media::AlsaWrapper* wrapper,
    const char* device_name,
    int channels,
    int sample_rate,
    snd_pcm_format_t pcm_format,
    int latency_us);

int CloseDevice(media::AlsaWrapper* wrapper, snd_pcm_t* handle);

snd_mixer_t* OpenMixer(media::AlsaWrapper* wrapper,
    const std::string& device_name);

void CloseMixer(media::AlsaWrapper* wrapper,
    snd_mixer_t* mixer,
    const std::string& device_name);

snd_mixer_elem_t* LoadCaptureMixerElement(media::AlsaWrapper* wrapper,
    snd_mixer_t* mixer);

} // namespace alsa_util

#endif // MEDIA_AUDIO_ALSA_ALSA_UTIL_H_
